can't run netstat

Both on kinetic and focal, there is a problem with netstat.

On Kinetic, if you install logwatch and type in the command from below, there is a message about the problem within the zz-network file.

$ sudo logwatch --detail Low --range today --service all --output stdout

------------- Listening sockets ---------------

 can't run netstat: No such file or directory at /usr/share/logwatch/scripts/services/zz-network line 177.

 ---------------------- Network Report End -------------------------

On Focal, the situation looks similar. The network statistics are shown but at the end of the output the following message appears:

------------- Network statistics ---------------
....

sh: 1: netstat: not found

----------------------- Network statistics -----------------------

To reproduce the situation on Focal, pass
   if ( -f $pathto_ip) {
     $cmd_to_show_int=$pathto_ip." a";
    }
    else
    {
     $cmd_to_show_int="$pathto_ifconfig -a";
    }

between lines 352 and 362 to avoid another problem which is being resolved here: https://bugs.launchpad.net/ubuntu/+source/logwatch/+bug/1890748